Toothbrush



FIG. 1 is a perspective view of a toothbrush showing my new design;

FIG. 2 is a front view of the toothbrush of FIG. 1;

FIG. 3 is a back view of the toothbrush of FIG. 1; and,

FIG. 4 is a right side view of the toothbrush of FIG. 1, and the left side view being a mirror image thereof.

The broken lines depict portions of the toothbrush that form no part of the claimed design. 

CLAIM The ornamental design for a toothbrush, as shown and described. 